Trussed ladder.



No. 669,7". Patented Mar. I2, 19m.

F. s. SEAGRAVE.

TRUSSED LADDER. {Application filed. Apr. 9. 190

FREDERIO S. SEAGRAVE, OF COLUMBUS, OHIO.

TRUSSED LADDER.

SPECIFICATION forming part of Letters Patent No. 669,71 1, dated March 12, 1901.

Application filed April 9, 1900.

To all whom it may concern.-

Be it known that I, FREDERIC S. SEAGRAVE, acitizen of the United States, residing at O0- lumbus, in the county of Franklin and State of Ohio, have invented a certain new and useful Improvementin 'Irussed Ladders,of which the following is a specification.

My invention relates to the improvement of trussed ladders, and has particular relation to the improvement of that class of ladders shown in my former patent, No. 607,665, dated July 19, 1898.

The objects of my invention are to provide a trussed ladder with improved means for connecting the legs or side bars and trusses of the ladder-frame, to so construct and apply said connecting device as to obviate any tendency toward the legs and trusses working loose or separating, and to produce other improvements, the details of which will be more fully pointed out hereinafter. These objects Iaccomplish in the manner illustrated in the accompanying drawings, in which- Figure 1 is a view in perspective of the lower portion of a trussed ladder, the latter being shown inverted and having my improvement thereon. Fig. 2 is a central vertical section of the lower portion of the ladder leg and truss, showing the same united by my improved uniting-plate; and Fig. 3 is a detail view in perspective of a portion of said uniting-plate.

Similar numerals refer to similar parts throughout the several views.

1 represents the parallel legs of a ladder; which are connected in the usual manner by transverse rounds 2.

3 represents the truss-bars or truss-frame pieces, which are bowed downward from and have their ends rigidly connected with the end portions of the legs 1 in the manner here-' inafter described.

My improved uniting plate or bar, which is shown more clearly in Fig. 3 of the drawings, consists, as indicated, of a metallic bar 4,

, which at desirable intervals has formed therewith upperand lower transverse shoulderlugs or half-round projections 5. Through Serial No. 12,070. (No model.)

end of the bar 4 with a head 7, which is of equal width with said bar and which is of the pointed or arrowhead shape shown. In forming the inner surfaces of the end portions of the ladder-legs and truss-bars 1 and 3 I produce therein oppositely-located transverse rounded recesses 8.

In utilizing my device one of the bars 4 is inserted between each end portion of the ladder-leg and its adjoining truss-bars or lug projections 5 entering the inner side recesses 8 of said parts. When in this position, the inner flat surfaces of the head 7 is designed to engage the ends of said ladder-leg and truss-sections. The parts thus described are now united through the medium of bolts 9, which pass downward through oppositely-located bolt-holes form ed in said ladder-leg and truss-section and through the bolt-holes 6 of the uniting plate or bar 4, the threaded ends of said bolts being engaged by nuts 10.

From the construction above described it will be seen that the lad der-leg and truss will be prevented from separating longitudinally or sliding one on the other through the employment of the engaging projections 5 on the bar 4 and through the further employment of the bolts 9, the nuts on which may be tightened, as desired, to compensate for any shrinkage of the wood.

It is obvious that the head 7 when pointed in the manner shown and described will serve when employed on the lower ends of the ladder-legs to facilitate the engagment or retention of the said legs in engagement with the ground or other surface. It is evident, however, that the pointed feature of said head may be omitted and any suitable form of head may be employed.

By the construction above described it will be seen that simple, reliable, and inexpensive means are provided for producing an exceedingly-desirable connection of the truss and leg of a trussed ladder and that the uniting device shown and described may be readily applied for the purpose set forth.

Having now fully described myinvention, what I claim, and desire to secure by Letters Patent, is-

In a trussed ladder, the combination with the legs, rounds and trusses, said legs and trusses having their adjoining end portions provided with innerside recesses 8, of a meportions and bolts uniting said truss andieg tallic bar or plate 4 interposed between said and said interposed plate or bar, substanleg and truss end portions, said bar having tially as specified.

formed thereon oppositely-located transverse FREDERIC S. SEAGRAVE. 5 lugs 5 which engage the recesses 8 and hav- In presence of- I ing formed on its outer end a pointed head 7 A. L. PHELPS,

which engages the ends of said truss and leg W. L. MORROW. 

